Abstract
The dentin bonding durability of a total-etch adhesive system (Prime & Bond NT) was investigated by tensile bond test using conventional and dumbbell-shaped specimens. The results of the present study clarify that the bonding durability of dry-bonded Prime & Bond NT restorations was lower than that of wet-bonded restorations, and that cohesive failures in demineralized dentin can be detected earlier in tensile bond tests using dumbbell-shaped specimens when compared with conventional specimens.